What do the AF-A, AF-C, and AF-S autofocus settings mean?
My camera has these settings for autofocus, and I don't know what they mean. I suspect "A" is "Auto", and "C" is "continuous", but I have no idea what "S" is.
@Matt: It's a Nikon D7000 but I believe I have seen similar markings on a friend's Canon before.
@Rowland: No, I'm not talking about AF-S lenses, I'm talking about the autofocus mode. (It's unfortunate the names overlap)
It's often best to include enough information in the question to make it unambiguous -- I see Craig has now edited it to include that; it would also be good in the future to give an indication as to what your camera is; many of the abbreviations used are specific to a particular manufacturer (for example, @vlad259 tries to cover both options)
This link explains it well. Paraphrasing the article:
- AF-C (AF-continuous or servo mode) is used for photographing moving subjects.
- AF-S means single shot and is used for subject that is stationary.
- AF-A is where the camera decides whether the subject is moving or not and tries to alternate between the servo and single shot mode accordingly.